Switch the background color in PDF Viewer when using Material Design

chrome/browser/resources/pdf/pdf.js

Index: chrome/browser/resources/pdf/pdf.js
diff --git a/chrome/browser/resources/pdf/pdf.js b/chrome/browser/resources/pdf/pdf.js
index b6d5caa5d35079af211be6911ac116be1d88236d..9df88543bac5073080bd4d223d72059ccb471067 100644
--- a/chrome/browser/resources/pdf/pdf.js
+++ b/chrome/browser/resources/pdf/pdf.js
@@ -90,6 +90,9 @@ function PDFViewer(streamDetails) {
         (window.innerHeight - this.toolbarHeight_) + 'px';
   this.plugin_.style.width = window.innerWidth + 'px';
 
+  if (this.isMaterial_)
+    this.plugin_.setAttribute('is-material', '');
+
   // Handle scripting messages from outside the extension that wish to interact
   // with it. We also send a message indicating that extension has loaded and
   // is ready to receive messages.